GM Service Manual Online
For 1990-2009 cars only

The fuel filler system is contains the following components:

    • Fuel door release relay
    • Fuel tank filler door lock actuator
    • Fuel tank filler door lock release switch
    • Body control module (BCM)

The fuel filler door is released by operating the fuel tank filler door lock release switch. The vehicle must be in the PARK position for the fuel filler door to operate. When the fuel tank filler door lock release switch is operated, ground is applied the coil side of the fuel door release relay. When the relay is grounded the switch contacts close and provide battery voltage to the fuel tank filler door lock actuator and the fuel filler door opens.